Remove duplicate image tests for tenant authZ
Remove duplicate image tests for tenant authZ

* Remove 'test_delete_image_of_another_tenant' which duplicates
test_delete_image_for_alt_account in authorization tests
* Remove 'test_create_image_for_server_in_another_tenant' which duplicates
test_create_image_for_alt_account_fails in authorization tests

Fixes bug #1130462
Change-Id: I18a1a5345f21ec4d055ae5c0dcae858feaf143c8

alinbalutoiu/tempest,bigswitch/tempest,LIS/lis-tempest,Lilywei123/tempest,JioCloud/tempest,citrix-openstack/build-tempest,NexusIS/tempest,neerja28/Tempest,Mirantis/tempest,sebrandon1/tempest,varunarya10/tempest,nunogt/tempest,rakeshmi/tempest,BeenzSyed/tempest,roopali8/tempest,ntymtsiv/tempest,alinbalutoiu/tempest,Juraci/tempest,masayukig/tempest,adkerr/tempest,jaspreetw/tempest,dkalashnik/tempest,tudorvio/tempest,cisco-openstack/tempest,neerja28/Tempest,citrix-openstack/build-tempest,izadorozhna/tempest,itskewpie/tempest,LIS/lis-tempest,openstack/tempest,danielmellado/tempest,afaheem88/tempest,rzarzynski/tempest,hpcloud-mon/tempest,queria/my-tempest,afaheem88/tempest_neutron,zsoltdudas/lis-tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,Juniper/tempest,rakeshmi/tempest,Vaidyanath/tempest,vmahuli/tempest,armando-migliaccio/tempest,BeenzSyed/tempest,Tesora/tesora-tempest,Juraci/tempest,hpcloud-mon/tempest,manasi24/tempest,NexusIS/tempest,afaheem88/tempest,sebrandon1/tempest,vedujoshi/tempest,tonyli71/tempest,adkerr/tempest,jaspreetw/tempest,redhat-cip/tempest,ebagdasa/tempest,vedujoshi/os_tempest,zsoltdudas/lis-tempest,hayderimran7/tempest,cisco-openstack/tempest,izadorozhna/tempest,armando-migliaccio/tempest,vmahuli/tempest,jamielennox/tempest,jamielennox/tempest,queria/my-tempest,vedujoshi/os_tempest,openstack/tempest,eggmaster/tempest,dkalashnik/tempest,manasi24/jiocloud-tempest-qatempest,bigswitch/tempest,CiscoSystems/tempest,FujitsuEnablingSoftwareTechnologyGmbH/tempest,citrix-openstack-build/tempest,ebagdasa/tempest,pczerkas/tempest,CiscoSystems/tempest,pandeyop/tempest,cloudbase/lis-tempest,Lilywei123/tempest,citrix-openstack-build/tempest,afaheem88/tempest_neutron,flyingfish007/tempest,redhat-cip/tempest,nunogt/tempest,Vaidyanath/tempest,yamt/tempest,yamt/tempest,Mirantis/tempest,cloudbase/lis-tempest,itskewpie/tempest,manasi24/tempest,tonyli71/tempest,xbezdick/tempest,hayderimran7/tempest,xbezdick/tempest,Juniper/tempest,pczerkas/tempest,roopali8/tempest,akash1808/tempest,manasi24/jiocloud-tempest-qatempest,akash1808/tempest,danielmellado/tempest,vedujoshi/tempest,ntymtsiv/tempest,tudorvio/tempest,flyingfish007/tempest,pandeyop/tempest,eggmaster/tempest,rzarzynski/tempest,varunarya10/tempest,JioCloud/tempest,masayukig/tempest,Tesora/tesora-tempest